655561000 has 32 divisors (see below), whose sum is σ = 1534015080. Its totient is φ = 262224000.

The previous prime is 655560991. The next prime is 655561001. The reversal of 655561000 is 165556.

It can be written as a sum of positive squares in 4 ways, for example, as 76003524 + 579557476 = 8718^2 + 24074^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 655561000.

It is not an unprimeable number, because it can be changed into a prime (655561001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326781 + ... + 328780.

Almost surely, 2^655561000 is an apocalyptic number.

It is an amenable number.

655561000 is an abundant number, since it is smaller than the sum of its proper divisors (878454080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

655561000 is a wasteful number, since it uses less digits than its factorization.

655561000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655582 (or 655568 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 655561000 is about 25603.9254802852. The cubic root of 655561000 is about 868.7024299816.

The spelling of 655561000 in words is "six hundred fifty-five million, five hundred sixty-one thousand".